Sound-box for talking-machines.



E. H. MOBLEY.

SOUND BOX FOR TALKING MACHINES.

APPLICATION FILED AUG. 17, 1907.

955,894. Patented Apr. 26, 1910.

EDWIN H. MORLEY, F HILLSIDE, PENNSYLVA NIA.

SO UND-BOX FOB. TALKIN G-MACHIN ES.

Specification of Letters Patent.

Patented Apr. 26, 1910.

A lication filed August 17, 1907. Serial No. 389,028.

To all whom it mi 1! concern} Be it lmown tnat. I, EDWIN H. Mommy,

a citizen of theUnited States, residing in Hillside, Montgomery county,Pennsylvania, have invented certain Improvements in Sound-Boxes forTalking-Machines, of which the following is a specification;

My invention relates to sound boxes for use in connection with recordshaving grooves of the--hill-and-valley type, the objects of my inventionbeing to provide for the secure connection of the stylus lever to' thediaphragm, and for the proper contact of the stylus with the undulatingbottom of the groove without impairing the desired freedom of movementof saidstylus and without affecting the purity of the reproduction.These objects I attain in the' manner hereinafter set forth, referencebeing had to the accompanying drawing, in which-- Figure l is a viewpartly in side elevation and partly in vertical longitudinal section ofa sound box constructed in accordance with my invention; Fig. 2 is aperspective View showing certain elements -of said sound box detachedtherefrom; Fig. 3- is an enlarged perspective View of the blank fromwhich the diaphragm connection is made; Fig. 4 is a. perspective view ofthe same after it has been bent for application to the diaphragm andconnecting link, and

Fig. 5 is a sectional view illustrating a modification of one of thefeatures of my in vention.

1 represents the cup-like casing of the sound box to which the diaphragm2 may be secured in any desired Way, the means adopted in the presentinstance for effecting this object being a threaded. ring 3 whichengages a thread formed on the inner wall of the sound box and serves toconfine the outer portion of the diaphragm against a suitable shoulderin said box.

The stylus 4 which engages the groove of the record is carried, asusual, by one arm of a stylus'lever 5, pivotally mounted upon a bracket6 which is secured to a weighted arm 7, the other arm of said leverbeing connected to the diaphragm 2 by means of a link 8 which passesthrough a central opening in the arm 7.

The arm 7 is hung by means of a pivot pin 9 to a block lO, which ispivotally mounted upon a pin 11, the latter passing through an openingin the sound box casing,

and having a threaded upper end for the re ception of a nut 11 whichbears upon said casing. The pin 11 is disposed at a right angle to thepivot pin 9, whereby swinging movement of the arm 7 in all directions ispermitted within the limits imposed by contact of a projecting pin 12 atthe outer end of the'arm with a yoke 13 projecting from the face of thesound box, as shown in Fig. 1,- freedom of lateral movement beinginsured owing to the fact that the block can swing upon the pin 11, andthe latter can turn in the opening to which it is adapted.

It is advisable in many cases to employ in connection with the arm 7 aspring for pressing upon said arm and imparting an outward thrustthereto. Such a sprin is illustrated at 14 in the drawing, one en of thespring being secured, by soldering or otherwise, to the pivoted block10, and its other end bearing upon the inner face of the arm 7, thespring'having a central opening or slot for the passage of the link 8.By this means the spring partakes freely of the lateral movements of thearm 7 and there fore opposes no resistance to such movements or to themovements of the stylus 4 and stylus lever 5, consequently the freedomofv movement of the stylus is not restricted in any way by the action ofthe spring, nor is the purity of the reproduction impaired by anyscraping contact of the spring with the. lever, as it would beif saidspring was mounted upon a fixed member of the sound box casing insteadof upon the pivoted and swinging block 10. In so far as the attainmentof the desired result is concorned, it is, in a measure, immaterialwhich end of they spring is the one to be secured, although theconstruction shown is preferred.

If adjustment of the tension of the spring let is desirable, this may beeffected either by means of an adjustable screw 15 carried by the block10, and bearing upon the spring in advance of its point of connection tothe block, as shown .in Fig. 1, or by means of a screw 16 carried by thearm 7 and constituting the bearing point for the free end of the spring,as shown in Fig. 5.

The link 8 is usually cemented to the diaphragm 2 but this is anunstable and otherwise objectionable means of attachment, in place ofwhich I use a clip consisting of a strip 20 of sheet metal as shown inFig. 3,

this stri being first bent, as shown in Fig. 4, so as to orm a loop 21with shoulders 22 at the base and projecting wings 23, which after beingpassed through a central openingin the diaphragm are bent down upon theback of the same, a washer 24 being, by preference, interposed betweenthe diaphragm and the bent wings, and another washer 25 beingindiaphragm, provides a stable connectionv which is not impaired by longcontinued use of the sound box or by changes of tem perature or roughhandling to which the sound box may be subjected.

I claim I l. The combination, in a sound; box for talking machines, ofthe sound box casin and its diaphragm, a stylus lever connecte to thediaphragm, an arm to which said stylus lever is ivoted, a member towhich said arm is pivoted, said member having pivotal connection withthe casing the axis of WI 'ch connection is at right angles to the pivoof the arm, and a spring cooperating with the arm and with said pivotmember, said spring bein secured atone end to one of sai to the pivotedarm.

talking machines, of the sound box casin 40 2. The combination, in asound box for and its'diaphragm, a stylus lever connected 1 to thediaphragm, anf arm to which said stylus lever is pivoted, a member towhich said arm is pivoted, said member having pivotal connection withthe casing the axis of which connection is at right angles to the pivotof the arm, and a spring connected to said pivot member and bearing uponthe back of the arm so, as thrust to the latter. I 3. The combination,in a sound box for talking machines, of the sound box casin and itsdiaphragm, a stylus lever connected to the diaphragm, an armto whichsaid 'stylus lever is pivoted, a block to which said armis pivoted, apin upon which said block is pivotally mounted, said pin being disposedat right angles to the pivot pin of the arm and being" pivotally mountedin the casing, and a spring cooperating with the aim and with the pivotblock, said spring being secured to one ofsaid parts and serving toimpart outward thrust to the arm.

4, The combination, in a sound box for talking machines, of the soundbox casin andits diaphragm, a stylus lever connected parts. an,imparting outward thrust to impart outward and its diaphragm,

"block mounted upon said casing, an arm to the diaphragm, an arm towhich said stylus lever is pivoted, a block to which said arm ispivoted, a pin upon wluch said block is pivotally mounted, said pinbeing disposed at right angles to the pivot in of the arm and beingpivotally mounte in the casing, and a spring secured to said pivot blockand bearing upon the back of the arm so as to impart outward thrustthereto.

5. The combination, in a sound box for talking machines, of the casingand its diaphragm, a pin pivotally mounted in said casing and having ablock pivotall mounted thereon, an arm pivoted to said lock, and astylus lever pivotally mounted on said arm and acting upon thediaphragm.

6. The combination, in a sound box for block on said casing, an armpivoted to said block and carrying a stylus lever which-acts upon thediaphragm, a spring cooperating with said arm and block and-secured toone of said parts, and means icarrid by the swing' g block for .garyiiigthe tension of said spriiig. I

8. 'lhe combination, in a sound box for talking machines, of the soundbox casing and its diaphrag n' a pivoted and swing- "ing block mountedupon said casin an arm pivotally mounted upon said bloc and carrying astylus lever which acts upon the diaphragm, a spring secured at one endto said block and bearing at the other end upon the arm, and means forvarying the tension of 'said spring.

9. The combination, in a sound box for talking machines, of the soundbox casing a pivoted and swinging pivotally mounted upon said block andcarrying a stylus lever which acts upon the diaphragm, a spring securedat one end to said block and hearing at the other endupon the arm, andmeans carried by the swinging block for varying the tension of saidspring.

10. The combination, in a sound box for talking machines, of the soundbox casing and its perforated diaphragm, a clip passing through said diahragm and having, on the outer face thereo a member with shouldersproviding a bearing therefor, and projecting w ngs bent down on theinner face of the diaphragm, a washer interposed between the diaphragmand said wings, another washer interposed between the diaphragm and itsthe back of the same, a washer interposed between the diaphragm and theshouldered portion of the loop, a washer interposed between thediaphragm and thebent wings of the clip, a stylus lever and a connectionbe- 15 tween said stylus lever and the loop portion of the clip.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing Witnesses.

EDWIN H. MOBLEY.

Witnesses:

HAMILTON D. TURNER, KATE A. BEADLE.

